Available 
Rock Hard Super Firm Foam Mattress
from £244-£448.
£244-£448
Sizes tracked: Single, Small Double, Double, King Size, Super King
Sleep guide
How to choose the right mattress for your sleeping position
Side, back and front sleepers need different blends of firmness, support and pressure relief, and these three firm memory foam examples show how that changes the buying decision.
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Last verified: 2026-09-29
Why sleeping position changes mattress choice
Your sleep position changes where your body presses hardest into the mattress, so two products that both look firm can still feel very different once you lie on them. Side sleepers usually need more give at the shoulders and hips, while back and front sleepers often want a steadier surface that supports the midsection without too much sink. The three examples here keep the comparison focused: Rock Hard Super Firm Foam Mattress, Rock Hard Super Firm Foam Mattress, European and Bodyshape Ortho Memory Foam Mattress are all memory foam and all sit in a firm-to-extra-firm part of the market, so they work well as reference points for support-led buying.
Best mattress feel for side sleepers
Side sleepers should be cautious with very firm memory foam because the shoulder and hip contact points need enough pressure relief to avoid an overly rigid feel. That does not mean a firm mattress cannot work, but it does mean the shopper should check whether the comfort layer and overall build leave enough cushioning for the body shape involved. On this shortlist, the Bodyshape Ortho Memory Foam Mattress is the lower-priced firm option at £167-£313, while the Rock Hard Super Firm Foam Mattress is described as extra firm, which is more likely to suit shoppers who already know they prefer a much more solid feel.
Best mattress feel for back and front sleepers
Back and front sleepers often lean toward firmer mattresses because a more supportive surface can help prevent the midsection from sinking too deeply. The Rock Hard Super Firm Foam Mattress is positioned as extra firm and is described as a full foam block with no springs, edge-to-edge support and orthopaedic support, so it is the most assertive feel in the trio. Bodyshape Ortho Memory Foam Mattress is still firm, but its reflex foam support system plus 3cm of memory foam gives it a different balance, which may matter if you want firmness without going all the way to the most rigid option.
How construction, depth and delivery affect the buy
Construction matters because it changes how firmness feels in use, not just how it is described. Rock Hard Super Firm Foam Mattress uses a full foam block and is listed at 23cm deep, rolled for delivery and single-sided, while Bodyshape Ortho Memory Foam Mattress combines reflex foam support with a memory foam comfort layer, giving it a more layered feel on paper. Depth can also affect bedding and bed-frame fit, so that 23cm figure is worth checking against your base, especially if you use fitted sheets, a topper or a low-profile frame. The Rock Hard range also shows a broader size list than the European version, which has one visible size option, so size flexibility may be just as important as comfort when you compare value.
What the retailer details suggest
The strongest reassurance on the page comes from the visible product details rather than broad claims. Rock Hard Super Firm Foam Mattress shows a 10-year guarantee, a 100-night comfort trial, a 4.7/5 visible rating average and five size variants, while Bodyshape Ortho Memory Foam Mattress shows a 3-year guarantee, a 100-night comfort trial, a 4.5/5 visible rating average and five size variants. The European Rock Hard version sits at the top end of the price range at £454 with just one visible size variant, so it looks more specialised than the main Rock Hard model rather than a straightforward upgrade for every shopper. Review count information is not visible, so the ratings should be treated as limited reputation signals rather than proof of performance.
How to compare the shortlist before you buy
This is a comparison of trade-offs, not a search for one universal winner. If budget matters most, Bodyshape Ortho Memory Foam Mattress starts from £167 and still gives you a firm memory foam format with a 100-night comfort trial and broad size coverage, which makes it the easiest entry point in the set. If you want the most assertive feel and the longest guarantee on the page, Rock Hard Super Firm Foam Mattress is the clearer reference point, but it costs more and is described as extra firm, so side sleepers should be especially careful. The European Rock Hard version is the priciest at £454 and has only one visible size variant, so it only makes sense if that specific size is the one you need and the price premium is justified by fit rather than just brand name.
Mattresses to use as comparison examples
Available
Rock Hard Super Firm Foam Mattress, European
from £454.
£454
Sizes tracked: European King
Available 
Bodyshape Ortho Memory Foam Mattress
from £167-£313.
£167-£313
Sizes tracked: Single, Small Double, Double, King Size, Super King
Retailer details used
Last checked 2026-09-29. The source list below is included to help you check the details behind the comparison. Always confirm the latest price, delivery cost, stock status and product details with the retailer before buying.
- Rock Hard Super Firm Foam Mattress | MattressOnlineproduct-page evidence for Rock Hard Super Firm Foam Mattress
- Bodyshape Ortho Memory Foam Mattress | MattressOnlineproduct-page evidence for Bodyshape Ortho Memory Foam Mattress
- The Best Mattresses for Each Sleeping Position | MattressOnlinePrimary retailer guidance on side/back/front/combo sleep-position needs and firmness guidance.
- Sleep Solutions for Side Sleepers - MattressOnlineSide-sleeper pressure-relief guidance.
- Best Sleeping Positions for Back Pain Relief - Mattress OnlineBack-sleeping alignment context and mattress/pillow support framing.
- Firm Mattresses - 100-Night Trial - MattressOnlineFirmness guidance for front/back sleepers.
Helpful next reads
Use these related mattresses guides and reviews to turn the advice into a practical shortlist.
Firmness questions
Which sleeping positions usually suit firm memory foam mattresses best?
Firm memory foam often works best for back and front sleepers who want a steadier surface and less sink around the midsection. Side sleepers can still consider it, but they should check whether the mattress leaves enough cushioning at the shoulders and hips, especially on very firm models like Rock Hard Super Firm Foam Mattress.
Is extra firm always better for back sleepers than side sleepers?
No. Extra firm can feel supportive for some back sleepers, but side sleepers often need more pressure relief than an extra firm surface provides. The best match depends on your body shape, comfort preference and whether the mattress still allows enough contouring for the shoulders and hips.
How should shoppers weigh guarantee length against price and size availability?
A longer guarantee can be reassuring, but it should not override the right size or the right firmness. For example, Rock Hard Super Firm Foam Mattress shows a 10-year guarantee and five sizes, while the European version is £454 with only one visible size, so fit and value need to be checked together.
How does mattress depth affect bed-frame fit and bedding choice?
Depth matters because it can affect how the mattress sits on your base and whether your bedding fits neatly. The Rock Hard Super Firm Foam Mattress is 23cm deep, so it is worth checking against your bed frame, sheets and any topper before buying.
Can a firm memory foam mattress work for combination sleepers?
Sometimes, but it depends on what you need from the mattress in each position. If you switch between side and back sleeping, a very firm model may feel too rigid on your side, so compare the firmer support of Rock Hard against the slightly more layered feel of Bodyshape before deciding.